Doctor Who: 14 Cool Details Revealed In David Tennant's The End Of Time Part One Commentary

14. Bernard Cribbins Wore His Own Hat

The episode opens on an ordinary Earth high street, before panning down to Donna Noble's granddad, Wilfred Mott, played by the delightful Bernard Cribbins.

Here, Tate and Tennant point out a fun little detail about his costume. See that red hat he's wearing? That wasn't provided to him by the production crew - it's actually Cribbins' own hat that he brought from home.

In addition, Lyn points out that the badge pinned to his hat is a reference to Wilf's military days, which the character talks about in The End Of Time Part Two. This military experience is another thing that Cribbins brought from his own personal life, with writer Russell T Davies choosing to make it a part of Wilf's character.